Planetary gear box integrally injection molded with motor housing

Abstract

The utility model discloses a kind of planetary gear box integrally injection moulded with motor shell, including box, planetary gear and motor, box includes base, base is located at the output end of motor, planetary gear includes first inner ring gear, first inner ring gear is integrally formed with base, motor includes motor shell, motor shell is equipped with filling portion at the connecting place with base, for filling material, when base and motor shell are integrally by injection molding / casting, base is formed with connecting portion at lower end by filling portion, box is fixedly connected with filling portion by the cooperation of connecting portion and motor shell. By integrally forming on motor shell by injection molding base, replace traditional screw fixed connection, and first inner ring gear is integrally formed with base, reduce the number of assembly parts, and can effectively reduce the error of meshing between first inner ring gear and planetary gear, and slow down vibration using the structure of base and motor shell integration, reduce or even eliminate noise.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, and in particular to a planetary gearbox integrally injection molded with a motor housing. Background Technology

[0002] A gearbox (also known as a speed reducer or reducer) is a transmission device that connects a power source (such as an electric motor or internal combustion engine) to a working machine. Its core function is to reduce speed and increase torque through gear meshing, that is, to reduce the input speed and simultaneously increase the output torque to meet the power requirements of different equipment.

[0003] Gearboxes are divided into two categories: ordinary gearboxes and planetary gearboxes. Planetary gearboxes consist of a sun gear, multiple planet gears, an internal gear ring, and a planet carrier. The planet gears both rotate on their own axis and revolve around the sun, achieving multi-tooth meshing transmission. They have a compact structure and are arranged coaxially. Ordinary gearboxes, on the other hand, typically consist of a driving gear and a driven gear arranged on parallel shafts. They have a simple structure but are larger in size.

[0004] Planetary gear trains are a type of planetary gear train. As a coaxial transmission device with one degree of freedom, it consists of planetary gears, a central gear (including a sun gear and an internal ring gear), and a planetary frame. Basic types include NGWN, NGW, and NW. This gear train uses multiple planetary gears evenly distributed around the central gear. The transmission ratio is calculated using the transformation gear train method. It features a compact structure, a large transmission ratio, and good power distribution smoothness. It is mainly used in automobiles, wind turbines, metallurgical equipment, and other fields, undertaking load distribution and high power transmission functions.

[0005] The NGWN gear train is a single-stage planetary gear system, consisting of two internal ring gears, a double-planetary gear set (including a common planetary gear), a planet carrier that does not bear torque, and a sun gear. This structure is compact, small in size, and offers a wide range of transmission ratios. However, in traditional NGWN planetary gear reducers, the base and motor are typically fixed together with screws. During rotation, the meshing of the planetary gears generates vibrations due to errors, leading to noise. Furthermore, the screws are prone to loosening due to vibration. Loose screws increase the error between the internal ring gears and the planetary gears, further exacerbating vibration, accelerating gear wear, increasing noise, and potentially causing equipment malfunction.

[0006] Therefore, how to reduce vibration and noise while avoiding equipment failure caused by loose screws has become a pressing technical problem that needs to be solved. Utility Model Content

[0007] The purpose of this invention is to solve one of the above-mentioned defects and provide a planetary gearbox that is integrally injection molded with the motor housing.

[0008] The objective of this utility model is achieved through the following means: A planetary gearbox integrally injection molded with a motor housing includes a housing, planetary gears, and a motor. The housing includes a base located at the output end of the motor. The planetary gears include a first internal gear ring integrally formed with the base. The motor includes a motor housing with a filling portion at the connection between the motor housing and the base for filling material. When the base and the motor housing are integrally formed by injection molding / casting, the base forms a connecting portion at its lower end through the filling portion. The housing is fixedly connected to the motor housing through the cooperation of the connecting portion and the filling portion.

[0009] As a preferred embodiment, the cross-section of the filling part is an inverted T-shaped filling part, and the connecting part is formed by injection molding / casting to form an undercut structure that is compatible with the filling part.

[0010] As a preferred embodiment, the opening edge of the filling portion extends upward.

[0011] As a preferred embodiment, the system also includes an output spindle. The housing further includes a top cover, with the upper end of the output spindle extending from the top cover. The planetary gear further includes a sun gear, planet gears, a planet carrier, and a second internal gear ring. The sun gear and planet gears are mounted on the planet carrier. The second internal gear ring is integrally formed with the lower end of the output spindle. The sun gear meshes with the planet gears, and the lower part of the planet gears meshes with the first internal gear ring. The output shaft of the motor passes through the base and is driven by the sun gear. The upper part of the planet gears meshes with the second internal gear ring.

[0012] As a preferred embodiment, the top cover and the base are fastened together by a snap-fit ​​structure.

[0013] As a preferred embodiment, the top cover and the base are fastened together by a snap-fit ​​structure.

[0014] The beneficial effects of this utility model are as follows: by injection molding the base onto the motor housing to form an integral part, it replaces the traditional method of fixing with screws and integrally molding the first internal gear ring with the base, reducing the number of assembly parts, effectively reducing the meshing error between the first internal gear ring and the planetary gears, and using the integral structure of the base and the motor housing to reduce vibration and reduce or even eliminate noise. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment. Figure 2 This is an exploded view of the structure of an embodiment. Figure 3 This is a schematic diagram of the motor structure in an embodiment. Figure 4 This is a schematic diagram of the base structure of an embodiment. Figure 5 This is a cross-sectional schematic diagram of an embodiment. Explanation of reference numerals in the attached diagram: 1-Box body; 101-Base; 1011-First internal gear ring; 1012-Connecting part; 102-Top cover; 2-Sun gear; 3-Planet gear; 4-Planet carrier; 5-Motor; 501-Motor housing; 5011-Filling part; 502-Output shaft; 6-Output spindle; 601-Second internal gear ring. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] To facilitate understanding, this utility model will now be described in further detail with reference to specific implementation examples, but this is not intended to limit the utility model.

[0018] like Figure 1-5 As shown, this utility model discloses a planetary gearbox integrally injection molded with a motor housing 501, including a housing 1, planetary gears, a motor 5, and an output spindle 6. The housing 1 includes a base 101 and a top cover 102. The base 101 is located at the output end of the motor 5. The planetary gears include a sun gear 2, planet gears 3, a planet carrier 4, a first internal gear ring 1011, and a second internal gear ring 601. The first internal gear ring 1011 is integrally formed with the base 101. The motor 5 includes a motor housing 501. The motor housing 501 has a filling part 5011 at the connection with the base 101 for filling material. When the base 101 and the motor housing 501 are integrally formed by injection molding or casting, the base 101 forms a connecting part 1011 at the lower end through the filling part 5011. The housing 1 is fixedly connected to the motor housing 501 through the cooperation of the connecting part 1011 and the filling part 5011. By injection molding the base 101 onto the motor housing 501 to form an integral part, the traditional screw-fixed connection is replaced, and the first internal gear ring 1011 is integrally molded with the base 101. This reduces the number of assembly parts and can effectively reduce the meshing error between the first internal gear ring 1011 and the planetary gear 3. The integral structure of the base 101 and the motor housing 501 can also reduce vibration and reduce or even eliminate noise.

[0019] In this embodiment, in order to increase the contact area between the base 101 and the motor housing 501, the cross-section of the filling part 5011 is an inverted T-shaped filling part 5011, and the connecting part 1011 is formed by injection molding or casting to form an undercut structure that is compatible with the filling part 5011. In order to enhance the structural strength of the base 101 and the motor housing 501 in the horizontal direction, the opening edge of the filling part 5011 extends upward.

[0020] The upper end of the output spindle 6 extends from the upper cover 102. The sun gear 2 and planet gear 3 are mounted on the planet carrier 4. The second internal gear ring 601 is integrally formed with the lower end of the output spindle 6. The sun gear 2 meshes with the planet gear 3. The lower part of the planet gear 3 meshes with the first internal gear ring 1011. The output shaft 502 of the motor 5 passes through the base 101 and is driven by the sun gear 2. The upper part of the planet gear 3 meshes with the second internal gear ring 601.

[0021] The planet carrier 4 is a mature existing technology, so its specific structure will not be described in detail.

[0022] In practical applications, the connecting part 1011 is not limited to being integrally formed with the base 101. The connecting part 1011 can also be integrally formed with the motor housing 501. The base 101 is formed by injection molding or casting and forms a stable connection structure with the connecting part 1011.

[0023] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A planetary gearbox integrally injection molded with a motor housing, comprising a housing, planetary gears, and a motor, wherein the housing includes a base disposed at the output end of the motor, and the planetary gears include a first internal gear ring, characterized in that, The first internal gear ring is integrally formed with the base. The motor includes a motor housing. The motor housing has a filling part at the connection with the base for filling material. When the base and the motor housing are integrally formed by injection molding / casting, the base forms a connecting part at the lower end through the filling part. The housing is fixedly connected to the motor housing through the cooperation of the connecting part and the filling part.

2. The planetary gearbox integrally injection molded with the motor housing according to claim 1, characterized in that, The cross-section of the filling part is an inverted T-shaped filling part, and the connecting part is formed by injection molding / casting to form a barb structure that is compatible with the filling part.

3. The planetary gearbox integrally injection molded with the motor housing according to claim 2, characterized in that, The opening edge of the filling portion extends upward.

4. The planetary gearbox integrally injection molded with the motor housing according to claim 1, characterized in that, It also includes an output spindle, and the housing also includes a top cover. The upper end of the output spindle extends from the top cover. The planetary gear also includes a sun gear, planet gears, a planet carrier, and a second internal gear ring. The sun gear and planet gears are mounted on the planet carrier. The second internal gear ring is integrally formed with the lower end of the output spindle. The sun gear meshes with the planet gears. The lower part of the planet gears meshes with the first internal gear ring. The output shaft of the motor passes through the base and is driven and connected to the sun gear. The upper part of the planet gears meshes with the second internal gear ring.

5. The planetary gearbox integrally injection molded with the motor housing according to claim 4, characterized in that, The top cover and the base are fastened together by a snap-fit ​​structure.

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